S
M
T
W
T
F
S
29
41°
17°
30
41°
22°
1
40°
22°
2
39°
21°
3
42°
22°
4
39°
21°
5
38°
21°
6
40°
17°
7
36°
16°
8
42°
20°
9
41°
20°
10
42°
19°
11
26°
5°
12
25°
12°
13
35°
15°
14
34°
10°
15
35°
13°
16
37°
11°
17
37°
17°
18
35°
12°
19
34°
11°
20
31°
12°
21
30°
8°
22
39°
2°
23
28°
0°
24
26°
12°
25
28°
13°
26
37°
14°
27
36°
16°
28
37°
7°
29
34°
4°
30
32°
3°
31
31°
0°
1
29°
-2°
2
24°
2°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Joliet
Joliet's December 2026 forecast shows daily high temperatures ranging from 24° to 42°, with overnight lows between -2° and 22°. The average high for December is 35° with an average low of 12°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Joliet. See also: January | February | March.
